An extensive Collection of Stereoscopic and other Photographic Specimens. GEORGE KNIGHT & SONS, Foster Lane, London. * * * * * COLLODION PORTRAITS AND VIEWS obtained with the greatest ease and certainty by using BLAND & LONG'S preparation of Soluble Cotton; certainty and uniformity of action over a lengthened period, combined with the most faithful rendering of the half-tones, constitute this a most valuable agent in the hands of the photographer. Albumenized paper, for printing from glass or paper negatives, giving a minuteness of detail unattained by any other method, 5s. per Quire. Waxed and Iodized Papers of tried quality. Instruction in the Processes. BLAND & LONG, Opticians and Photographical Instrument Makers, and Operative Chemists, 153. Fleet Street, London. *** Catalogues sent on application. * * * * * THE SIGHT preserved by the Use of SPECTACLES adapted to meet every variety of Vision by means of SMEE'S OPTOMETER, which effectually prevents Injury to the Eyes from the Selection of Improper Glasses, and is extensively employed by BLAND & LONG, Opticians, 153. Fleet Street, London. * * * * * PHOTOGRAPHIC PAPERS manufactured by MESSRS. TOWGOOD, of St. Neot's Mills, as mentioned in "Notes and Queries," No. 220., Jan. 14. Commercial and Family Stationery, &c. Depôt for all Works on Physiology, Phrenology, Hydropathy, &c. Catalogues sent free on application. London: HORTELL & SHIRRESS, 492. New Oxford Street. * * * * * Printed by THOMAS CLARK SHAW, of No. 10. Stonefield Street, in the Parish of St. Mary, Islington, at No. 5. New Street Square, in the Parish of St. Bride, in the City of London; and published by GEORGE BELL, of No. 186. Fleet Street, in the Parish of St. Dunstan in the West, in the City of London, Publisher, at No. 186. Fleet Street aforesaid.--Saturday, March 18, 1854.